Ribs for fan



FIG. 1 is a front view of ribs for a fan showing my new design, the rearview being a mirror image thereof;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The ornamental design for ribs for fan, as shown and described.